Answer:
Given: Mass of books = 6.5 kg
Mass of CD's = 1.5 kg
Mass of DVD's = 2.0 kg
Total mass = 6.5 kg + 1.5 kg + 2.0 kg = 10 kg
<h3>Answer:</h3>
The smallest unit which maintains the physical properties of a compound is a <u>Molecule</u>.
<h3>Explanation:</h3>
Option-A, <u><em>Atom</em></u> is incorrect because statement is asking about the physical properties of a compound. Therefore, as compound is made up of two or more, same or different atoms hence, atom can not be the correct answer.
Option-B, <u><em>Element</em></u> is also incorrect because Element can be mono-atomic like He, Ne, Ar <em>e.t.c </em>or a molecules like N₂, O₂, F₂ <em>e.t.c</em> but it can't be a compound because in compound the joining elements are different as all compounds are molecules but all molecules are not compounds.
Option-C, <u><em>Molecule</em></u> is the correct answer because all compounds are molecules unless the atoms forming the compound are different.
Option-D, <em><u>Alloy</u></em> is also incorrect because Alloys are a homogeneous mixture of two or more metals. Hence, they can't be considered as compounds as they can be separated by physical means.
1. Given the following equation: N2 (g) + 3 H2 (g) ↔ 2NH3 (g) ΔH = -92 kJ/mol
a. this reaction is exothermic as ΔH is -ve
b. the equilibrium will shift 2 the left if nitrogen gas is removed
c. the equilibrium shift 2 the right if the temperature is lowered
d. the equilibrium shift 2 the left if ammonia (NH3) is added
e. principle of thermodynamic potential or Gibbs energy is used to answer B-D
3x10^-4 cm = 0.0003 cm
3x10^4 km = 30,000 km.
